A brief YouTube outage on Monday was the one of the biggest recent glitches for the popular video site, according to a company that uses complaints on Twitter and other sources to measure the impact of online outages.

The major U.S. mobile operators are all putting their weight behind a campaign against texting while driving that will include a blitz of advertising and a driving simulator touring the country this summer.

U.S. mobile operators will warn subscribers when they're heading toward a big bill, after most carriers agreed to send email or text alerts when users are about to exceed their monthly usage limits or start using international roaming.